Re: [PATCH net-next 2/3] bpf: permit multiple bpf attachments for a single perf event

Hi Yonghong,

[auto build test ERROR on net-next/master]

url:    https://github.com/0day-ci/linux/commits/Yonghong-Song/bpf-permit-multiple-bpf-attachments-for-a-single-perf-tracepoint-event/20171024-080608
config: i386-randconfig-h1-10241031 (attached as .config)
compiler: gcc-5 (Debian 5.4.1-2) 5.4.1 20160904
reproduce:
        # save the attached .config to linux build tree
        make ARCH=i386 

All errors (new ones prefixed by >>):

   kernel/events/core.o: In function `_free_event':
   core.c:(.text+0x5f1e): undefined reference to `perf_event_detach_bpf_prog'
   kernel/events/core.o: In function `perf_ioctl':

quoted

core.c:(.text+0x72b3): undefined reference to `perf_event_attach_bpf_prog'

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